2021 GMC ACADIA warning light

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
312 Vehicle Care
When the recommended pressure is
reached, the horn sounds once and the
turn signal lamp will stop flashing and
briefly turn solid.
Repeat these steps for all underinflated tires
that have illuminated the low tire pressure
warning light.
{Warning
Overinflating a tire could cause the tire
to rupture and you or others could be
injured. Do not exceed the maximum
pressure listed on the tire sidewall. See
Tire Sidewall Labeling 0302 and
Vehicle Load Limits 0209.
If the tire is overinflated by more than
35 kPa (5 psi), the horn will sound multiple
times and the turn signal lamp will continue
to flash for several seconds after filling
stops. To release and correct the pressure,
while the turn signal lamp is still flashing,
briefly press the center of the valve stem.
When the recommended pressure is reached,
the horn sounds once.
If the turn signal lamp does not flash within
15 seconds after starting to inflate the tire,
the tire fill alert has not been activated or is
not working. If the hazard warning flashers are on, the
tire fill alert visual feedback will not work
properly.
The TPMS will not activate the tire fill alert
properly under the following conditions:
.There is interference from an external
device or transmitter.
.The air pressure from the inflation device
is not sufficient to inflate the tire.
.There is a malfunction in the TPMS.
.There is a malfunction in the horn or turn
signal lamps.
.The identification code of the TPMS
sensor is not registered to the system.
.The battery of the TPMS sensor is low.
If the tire fill alert does not operate due to
TPMS interference, move the vehicle about
1 m (3 ft) back or forward and try again.
If the tire fill alert feature is not working,
use a tire pressure gauge.
TPMS Sensor Matching Process
Each TPMS sensor has a unique
identification code. The identification code
needs to be matched to a new tire/wheel
position after rotating the vehicle’s tires or
replacing one or more of the TPMS sensors. The TPMS sensor matching process should
also be performed after replacing a spare
tire with a road tire containing the TPMS
sensor. The malfunction light and the DIC
message should go off at the next ignition
cycle. The sensors are matched to the tire/
wheel positions, using a TPMS relearn tool,
in the following order: driver side front tire,
passenger side front tire, passenger side rear
tire, and driver side rear tire. See your
dealer for service or to purchase a relearn
tool. A TPMS relearn tool can also be
purchased. See Tire Pressure Monitor Sensor
Activation Tool at
www.gmtoolsandequipment.com or call
1-800-GM TOOLS (1-800-468-6657).
There are two minutes to match the first
tire/wheel position, and five minutes overall
to match all four tire/wheel positions. If it
takes longer, the matching process stops
and must be restarted.
The TPMS sensor matching process is:
1. Set the parking brake.
2. Place the vehicle in Service Mode. See Ignition Positions 0213.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
314 Vehicle Care
Use this rotation pattern when rotating
the tires.
Do not include the compact spare tire
in the tire rotation.
Adjust the front and rear tires to the
recommended inflation pressure on the
Tire and Loading Information label after
the tires have been rotated. SeeTire
Pressure 0307 and
Vehicle Load Limits 0209.
Reset the Tire Pressure Monitor System.
See Tire Pressure Monitor Operation
0 310. Check that all wheel nuts are properly
tightened. See
“Wheel Nut Torque”
under Capacities and Specifications
0 359, and “Removing the Flat Tire and
Installing the Spare Tire” underTire
Changing 0326.
{Warning
Rust or dirt on a wheel, or on the
parts to which it is fastened, can
cause wheel nuts to become loose
over time. The wheel could come off
and cause a crash. When changing a
wheel, remove any rust or dirt from
places where the wheel attaches to
the vehicle. In an emergency, a cloth
or paper towel can be used; however,
use a scraper or wire brush later to
remove all rust or dirt.
Lightly coat the inner diameter of the
wheel hub opening with wheel bearing
grease after a wheel change or tire
rotation to prevent corrosion or rust
buildup.
{Warning
Do not apply grease to the wheel
mounting surface, wheel conical
seats, or the wheel nuts or bolts.
Grease applied to these areas could
cause a wheel to become loose or
come off, resulting in a crash.
When It Is Time for New Tires
Factors, such as maintenance, temperatures,
driving speeds, vehicle loading, and road
conditions affect the wear rate of the tires.
Treadwear indicators are one way to tell
when it is time for new tires. Treadwear
indicators appear when the tires have only

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
Vehicle Care 315
1.6 mm (1/16 in) or less of tread remaining.
SeeTire Inspection 0313 and
Tire Rotation 0313 for additional
information.
The rubber in tires ages over time. This also
applies to the spare tire, if the vehicle has
one, even if it is never used. Multiple factors
including temperatures, loading conditions,
and inflation pressure maintenance affect
how fast aging takes place. GM recommends
that tires, including the spare if equipped,
be replaced after six years, regardless of
tread wear. To identify the age of a tire, use
the tire manufacture date, which is the last
four digits of the DOT Tire Identification
Number (TIN) molded into one side of the
tire sidewall. The last four digits of the TIN
indicate the tire manufactured date. The
first two digits represent the week and the
last two digits, the year. For example, the
third week of the year 2020 would have a
4-digit DOT date of 0320. Week 01 is the
first full week (Sunday through Saturday) of
each year.
Vehicle Storage
Tires age when stored normally mounted on
a parked vehicle. Park a vehicle that will be
stored for at least a month in a cool, dry,
clean area away from direct sunlight to slow aging. This area should be free of grease,
gasoline, or other substances that can
deteriorate rubber.
Parking for an extended period can cause
flat spots on the tires that may result in
vibrations while driving. When storing a
vehicle for at least a month, remove the
tires or raise the vehicle to reduce the
weight from the tires.
Buying New Tires
GM has developed and matched specific
tires for the vehicle. The original
equipment tires installed were designed
to meet General Motors Tire
Performance Criteria Specification (TPC
Spec) system rating. When replacement
tires are needed, GM strongly
recommends buying tires with the same
TPC Spec rating.
GM's exclusive TPC Spec system
considers over a dozen critical
specifications that impact the overall
performance of the vehicle, including
brake system performance, ride and
handling, traction control, and tire
pressure monitoring performance. GM's
TPC Spec number is molded onto the
tire's sidewall near the tire size. If the
tires have an all-season tread design,
the TPC Spec number will be followed
by MS for mud and snow. See
Tire
Sidewall Labeling 0302 for additional
information.
GM recommends replacing worn tires in
complete sets of four. Uniform tread
depth on all tires will help to maintain
the performance of the vehicle. Braking
and handling performance may be
adversely affected if all the tires are not
replaced at the same time. If proper
rotation and maintenance have been
done, all four tires should wear out at
about the same time. However, if it is
necessary to replace only one axle set
of worn tires, place the new tires on
the rear axle. See Tire Rotation0313.
{Warning
Tires could explode during improper
service. Attempting to mount or
dismount a tire could cause injury or
(Continued)

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
Vehicle Care 317
The Uniform Tire Quality Grading
(UTQG) system does not apply to deep
tread, winter tires, compact spare tires,
tires with nominal rim diameters of
10 to 12 inches (25 to 30 cm), or to some
limited-production tires.
While the tires available on General
Motors passenger cars and light trucks
may vary with respect to these grades,
they must also conform to federal
safety requirements and additional
General Motors Tire Performance
Criteria (TPC) standards.
Quality grades can be found where
applicable on the tire sidewall between
tread shoulder and maximum section
width. For example:
Treadwear 200 Traction AA Temperature A
All Passenger Car Tires Must Conform to
Federal Safety Requirements In Addition
To These Grades.
Treadwear
The treadwear grade is a comparative
rating based on the wear rate of the
tire when tested under controlledconditions on a specified government
test course. For example, a tire graded
150 would wear one and one-half (1½)
times as well on the government course
as a tire graded 100. The relative
performance of tires depends upon the
actual conditions of their use, however,
and may depart significantly from the
norm due to variations in driving habits,
service practices and differences in road
characteristics and climate.
Traction
The traction grades, from highest to
lowest, are AA, A, B, and C. Those
grades represent the tire's ability to
stop on wet pavement as measured
under controlled conditions on specified
government test surfaces of asphalt and
concrete. A tire marked C may have
poor traction performance. Warning:
The traction grade assigned to this tire
is based on straight-ahead braking
traction tests, and does not include
acceleration, cornering, hydroplaning,
or peak traction characteristics.
Temperature
The temperature grades are A (the
highest), B, and C, representing the
tire's resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled conditions
on a specified indoor laboratory test
wheel. Sustained high temperature can
cause the material of the tire to
degenerate and reduce tire life, and
excessive temperature can lead to
sudden tire failure. The grade C
corresponds to a level of performance
which all passenger car tires must meet
under the Federal Motor Safety
Standard No. 109. Grades B and A
represent higher levels of performance
on the laboratory test wheel than the
minimum required by law. Warning:
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, underinflation, or excessive
loading, either separately or in
combination, can cause heat buildup
and possible tire failure.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
318 Vehicle Care
Wheel Alignment and Tire
Balance
The tires and wheels were aligned and
balanced at the factory to provide the
longest tire life and best overall
performance. Adjustments to wheel
alignment and tire balancing are not
necessary on a regular basis. Consider an
alignment check if there is unusual tire wear
or the vehicle is significantly pulling to one
side or the other. Some slight pull to the
left or right, depending on the crown of the
road and/or other road surface variations
such as troughs or ruts, is normal. If the
vehicle is vibrating when driving on a
smooth road, the tires and wheels may
need to be rebalanced. See your dealer for
proper diagnosis.
Wheel Replacement
Replace any wheel that is bent, cracked,
or badly rusted or corroded. If wheel nuts
keep coming loose, the wheel, wheel bolts,
and wheel nuts should be replaced. If the
wheel leaks air, replace it. Some aluminum
wheels can be repaired. See your dealer if
any of these conditions exist.Your dealer will know the kind of wheel that
is needed.
Each new wheel should have the same
load-carrying capacity, diameter, width,
offset, and be mounted the same way as
the one it replaces.
Replace wheels, wheel bolts, wheel nuts,
or Tire Pressure Monitor System (TPMS)
sensors with new GM original equipment
parts.
{Warning
Using the wrong replacement wheels,
wheel bolts, or wheel nuts can be
dangerous. It could affect the braking and
handling of the vehicle. Tires can lose air,
and cause loss of control, causing a crash.
Always use the correct wheel, wheel
bolts, and wheel nuts for replacement.
Caution
The wrong wheel can also cause
problems with bearing life, brake cooling,
speedometer or odometer calibration,
headlamp aim, bumper height, vehicle
ground clearance, and tire or tire chain
clearance to the body and chassis.
Used Replacement Wheels
{Warning
Replacing a wheel with a used one is
dangerous. How it has been used or how
far it has been driven may be unknown.
It could fail suddenly and cause a crash.
When replacing wheels, use a new GM
original equipment wheel.
Tire Chains
{Warning
If the vehicle has 235/55R20, 245/65R17,
or 255/65R17 size tires, do not use tire
chains. There is not enough clearance.
Tire chains used on a vehicle without the
proper amount of clearance can cause
damage to the brakes, suspension,
or other vehicle parts. The area damaged
by the tire chains could cause loss of
control and a crash. Use another type of
traction device only if its manufacturer
recommends it for the vehicle's tire size
combination and road conditions. Follow
that manufacturer's instructions. To avoid
vehicle damage, drive slow and readjust
(Continued)

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
Vehicle Care 333
Caution (Continued)
to start the vehicle by pushing or pulling
it will not work, and it could damage the
vehicle.
1. Discharged Battery Positive (+)Terminal
2. Discharged Battery Remote Negative (-) Terminal
3. Good Battery Negative (-) Terminal
4. Good Battery Positive (+) Terminal
The jump start positive (+) Terminal (1) and
the negative remote negative terminal (2)
for the discharged battery are on the driver
side of the vehicle. The jump start positive (+) terminal (4) and
negative (-) terminal (3) are on the battery
of the vehicle providing the jump start.
1. Check the other vehicle. It must have a 12-volt battery with a negative ground
system.
Caution
If the other vehicle does not have a
12-volt system with a negative ground,
both vehicles can be damaged. Only use
a vehicle that has a 12-volt system with a
negative ground for jump starting.
2. Position the two vehicles so that they are not touching.
3. Set the parking brake and shift the vehicle into P (Park) with an automatic
transmission, or Neutral with a manual
transmission. See Shifting Into Park
0 217.
Caution
If any accessories are left on or plugged
in during the jump starting procedure,
they could be damaged. The repairs
would not be covered by the vehicle
(Continued)
Caution (Continued)
warranty. Whenever possible, turn off or
unplug all accessories on either vehicle
when jump starting.
4. Turn the ignition off. Turn off all lights and accessories in both vehicles, except
the hazard warning flashers if needed.
{Warning
An electric fan can start up even when
the engine is not running and can injure
you. Keep hands, clothing, and tools
away from any underhood electric fan.
{Warning
Using a match near a battery can cause
battery gas to explode. People have been
hurt doing this, and some have been
blinded. Use a flashlight if you need
more light.
Battery fluid contains acid that can burn
you. Do not get it on you. If you
accidentally get it in your eyes or on
your skin, flush the place with water and
get medical help immediately.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-14608671) - 2021 - CRC - 10/26/20
Index 383
IndexA
Accessories and Modifications . . . . . . . . . . . 268
Accessory Power . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Active Fuel Management . . . . . . . . . . . . . . . . 219
Adaptive Cruise Control . . . . . . . . . . . . . . . . . . 232
Add-On Electrical Equipment . . . . . . . . . . . . . 266
Additional InformationOnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Additional Maintenance and Care . . . . . . . . . 351
Adjustments Lumbar, Front Seats . . . . . . . . . . . . . . . . . . . . 38
Agreements Trademarks and License . . . . . . . . . . . . . . . 183
Air Cleaner/Filter, Engine . . . . . . . . . . . . . . . . 279
Air Conditioning . . . . . . . . . . . . . . . . . . . . .192, 196
Air Filter
Life System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Air Filter, Passenger Compartment . . . . . . . 197
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Airbag System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
How Does an Airbag Restrain? . . . . . . . . . . 58
Passenger Sensing System . . . . . . . . . . . . . . 59
What Makes an Airbag Inflate? . . . . . . . . . 58
What Will You See after an AirbagInflates? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
When Should an Airbag Inflate? . . . . . . . . 57
Where Are the Airbags? . . . . . . . . . . . . . . . . 55 Airbags
Adding Equipment to the Vehicle . . . . . . . 63
Passenger Status Indicator . . . . . . . . . . . . . 106
Readiness Light . . . . . . . . . . . . . . . . . . . . . . . . 105
Servicing Airbag-Equipped Vehicles . . . . . . 63
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Alarm
Vehicle Security . . . . . . . . . . . . . . . . . . . . . . . . 25
Alert Lane Change . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Side Blind Zone (SBZA) . . . . . . . . . . . . . . . . . 250
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 301
All-Terrain Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 302
All-Wheel Drive . . . . . . . . . . . . . . . . . . . . . 224, 289
AM-FM Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Antenna Multi-band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Antilock Brake System (ABS) . . . . . . . . . . . . . 224 Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . 110
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Apple CarPlay and Android Auto . . . . . . . . . . 173
Armrest Storage . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Assistance Program, Roadside . . . . . . . . . . . . 366
Assistance Systems for Driving . . . . . . . . . . 245
Assistance Systems for Parking and Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-14608671) - 2021 - CRC - 10/26/20
384 Index
AudioBluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Auto Stop Stop/Start System . . . . . . . . . . . . . . . . . . . . . 215
Automatic Dimming Mirrors . . . . . . . . . . . . . . . . . . . . . . . 28
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Emergency Braking (AEB) . . . . . . . . . . . . . . 247
Headlamp System . . . . . . . . . . . . . . . . . . . . . 133
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Transmission Fluid . . . . . . . . . . . . . . . . . . . . . 279
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . 223
Avoiding Untrusted Media Devices . . . . . . . .147
B
Battery Exterior Lighting Battery Saver . . . . . . . . . 137
Load Management . . . . . . . . . . . . . . . . . . . . . 136
Power Protection . . . . . . . . . . . . . . . . . . . . . . . 137
Battery - North America . . . . . . . . . . . . 288, 332
Blade Replacement, Wiper . . . . . . . . . . . . . . . 290
Bluetooth
Overview . . . . . . . . . . . . . . . . . . . . . . . . . 168, 169
Bluetooth Audio . . . . . . . . . . . . . . . . . . . . . . . . . 150
Brake Electric Boost . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Parking, Electric . . . . . . . . . . . . . . . . . . . . . . . . 224 Brake (cont'd)
System Warning Light . . . . . . . . . . . . . . . . . 108
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287 Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Automatic Emergency (AEB) . . . . . . . . . . . 247
Braking System Front Pedestrian (FPB) . . . . . . . . . . . . . . . . . 248
Break-In, New Vehicle . . . . . . . . . . . . . . . . . . . . . 212
Bulb Replacement Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 292
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . 292
Headlamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . . 315
C
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
California
Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . 268
California Proposition 65 Warning . . . . . . . . . . . . . . . . . . 268, 288, 332, Back Cover
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . . 1
Capacities and Specifications . . . . . . . . . . . . . 359 Carbon Monoxide
Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 219
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 208
Cargo Management System . . . . . . . . . . . . . . . . . . . 85
Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Caution, Danger, and Warning . . . . . . . . . . . . . .2
Center Console Storage . . . . . . . . . . . . . . . . . . . 84
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .318
Charging Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Charging System Light . . . . . . . . . . . . . . . . . . . 107
Check Engine Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Child Restraints Infants and Young Children . . . . . . . . . . . . . 66
Lower Anchors and Tethers forChildren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Older Children . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Securing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78, 80
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . 293
Cleaning Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 341